[PATCH] arm64: dts: uniphier: stabilize ethernet of LD20 reference boar

From: Masahiro Yamada
Date: Fri Apr 27 2018 - 00:26:35 EST


Currently, the ethernet RGMII mode on the LD20 reference board is
unstable.

The default drive-strength of ethernet TX pins is too strong because
there is no dumping resistor on the TX lines on the board.

Weaken the drive-strength to make the ethernet more stable.

Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---

arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts b/arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts
index 2c1a92f..440c2e6 100644
--- a/arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts
+++ b/arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts
@@ -67,3 +67,11 @@
reg = <0>;
};
};
+
+&pinctrl_ether_rgmii {
+ tx {
+ pins = "RGMII_TXCLK", "RGMII_TXD0", "RGMII_TXD1",
+ "RGMII_TXD2", "RGMII_TXD3", "RGMII_TXCTL";
+ drive-strength = <9>;
+ };
+};
--
2.7.4